package net.zoneland.zrdp.web.controller.common;

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Base64;
import java.util.concurrent.TimeUnit;
import javax.annotation.Resource;
import javax.imageio.ImageIO;

import org.springframework.util.FastByteArrayOutputStream;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import com.google.code.kaptcha.Producer;

import net.zoneland.zrdp.common.config.ZonevueConfig;
import net.zoneland.zrdp.common.constant.CacheConstants;
import net.zoneland.zrdp.common.constant.Constants;
import net.zoneland.zrdp.common.core.domain.AjaxResult;
import net.zoneland.zrdp.common.core.redis.RedisService;
import net.zoneland.zrdp.common.utils.uuid.IdUtils;
import net.zoneland.zrdp.system.service.ISysConfigService;

/**
 * 验证码操作处理
 *
 * @author zonevue
 */
@RestController
public class CaptchaController {
    @Resource(name = "captchaProducer")
    private Producer captchaProducer;

    @Resource(name = "captchaProducerMath")
    private Producer captchaProducerMath;

    @Resource
    private RedisService redisService;

    @Resource
    private ISysConfigService configService;
    /**
     * 生成验证码
     */
    @GetMapping("/captchaImage")
    public AjaxResult getCode() {
        final AjaxResult ajax = AjaxResult.success();
        final boolean captchaEnabled = configService.selectCaptchaEnabled();
        ajax.put("captchaEnabled", captchaEnabled);
        if (!captchaEnabled) {
            return ajax;
        }

        // 保存验证码信息
        final String uuid = IdUtils.simpleUUID();
        final String verifyKey = CacheConstants.CAPTCHA_CODE_KEY + uuid;

        final String capStr;
        final String code;
        final BufferedImage image;

        // 生成验证码
        final String captchaType = ZonevueConfig.getCaptchaType();
        if ("math".equals(captchaType)) {
            final String capText = captchaProducerMath.createText();
            capStr = capText.substring(0, capText.lastIndexOf("@"));
            code = capText.substring(capText.lastIndexOf("@") + 1);
            image = captchaProducerMath.createImage(capStr);
        } else {
            capStr = code = captchaProducer.createText();
            image = captchaProducer.createImage(capStr);
        }

        redisService.setCacheString(verifyKey, code, Constants.CAPTCHA_EXPIRATION, TimeUnit.MINUTES);
        // 转换流信息写出
        final FastByteArrayOutputStream os = new FastByteArrayOutputStream();
        try {
            ImageIO.write(image, "jpg", os);
        } catch (final IOException e) {
            return AjaxResult.error(e.getMessage());
        }

        ajax.put("uuid", uuid);
        ajax.put("img", Base64.getEncoder().encodeToString(os.toByteArray()));
        return ajax;
    }
}
